Vlsi Architecture for Discrete Wavelet Transform Based on B-spline Factorization

Based on B-spline factorization, a new category of architectures for Discrete Wavelet Transform (DWT) is proposed in this paper. The B-spline factorization mainly consists ofthe B-spline part and the distributedpart. The former is proposed to be constructed by use of Pascal implementation. And the latter is the only part requiring multipliers and can be implemented with Type-I or Type-I1 polyphase decomposition. Since the degree of the distributed part is usually designed as small as possible, the proposed architectures could need fewer multipliers than previous arts, but more adders would be required. However, many adders can he implemented with small area and low speed adders because only few adders are on the critical path. Two cases of the JPEG2000 defaulted (9,7) filter and the (6,lO) filter are given to demonstrate the efficiency of the proposed architectures.